Models: Add Entities/ folder

Elwig/Models/Entities/AT_Gem.cs

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+using Microsoft.EntityFrameworkCore;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Elwig.Models.Entities {
+    [Table("AT_gem"), PrimaryKey("Gkz")]
+    public class AT_Gem {
+        [Column("gkz")]
+        public int Gkz { get; private set; }
+
+        [Column("name")]
+        public string Name { get; private set; }
+
+        [InverseProperty("Gem")]
+        public virtual ISet<AT_Kg> Kgs { get; private set; }
+
+        [InverseProperty("AtGem")]
+        public virtual WbGem? WbGem { get; private set; }
+    }
+}